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six sigma

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  • #45972

    izzy
    Participant

    can someone please give me a simplified explanation of what six sigma is as i really do not understand!
    thankyou xx

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    #151259

    Jim Shelor
    Participant

    Dear Izzy,
    Six Sigma is a defined process that uses time tested statistical tools to reduce PROCESS VARIATION.
    Six Sigma gives management the information they need to make good decisions based on “data” rather than the “gut feel” hit or miss method used previously.
    Sincerely,
    Jim Shelor PMP, CSSBB

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    #151264

    gvrk
    Participant

    Hi Izzy,
    Well six sigma is nothing but a measure of variations. Let me take through a real time practical example to make you understand, wherever human biengs are involved obviously there exists variations. Now if we wish to measure how much is the variation from the mean(centerline ie. expected/target) is measured in terms of Standard deviation. Hence six sigma is all about measuring variations and minimizing the same.Hope i have explained in crisp as six sigma is a vast subject.

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    #151279

    Six Sigma is
    Member

    Izzy, Notice how Jack Welch defines Six Sigma, he says:
     
    “Nothing compares to the effectiveness of Six Sigma when it comes to improving a company’s operational efficiency, raising its productivity, and lowering its costs. It improves design processes, gets products to market faster with fewer defects, and builds customer loyalty. Perhaps the biggest but most unheralded benefit of Six Sigma is its capacity to develop a cadre of great leaders.”
     
    In addition to the other definitions you’ve been given so far, Six Sigma, today, is the language, in money and time ($,$,$ & T,T,T), of the “C” level office. It’s about the Quality of business that includes a problem solving structure (DMAIC) with the goal of creating measurable results in reasonable time (Breakthrough). Six Sigma is a road map and infrastructure for the vision, mission, and values of an organization. In a nutshell, Six Sigma is a purpose!
     
    The purpose to:
     
    Seek, Keep, and Increase Market Share (customers)!
    Increase Profit!
    Decrease Costs!
    Increase Shareholder Value!
    Reduce Variation!
    Reduce Waste!
    Reduce Defects!
    Streamline Operations!
    Simplify Daily Activities!
    Improve Quality!
    Gage Success!
    Increase Capability!
    Increase Capacity!
    Create Win/Win between Provider and Customer!
    Create Leadership/Leaders!
     This should give you the understanding that you are seeking. Next, you need to journey towards the knowledge of Six Sigma. You have found the right place to begin that journey. Welcome!

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    #151291

    Simon T
    Member

    A guy called Bill Smith started the nonsense with his statement:  “Another way to improve yield is to increase the design specification width. This influences the quality of product as much as the control of process variation does”. 
    Smith mentioned that out of control processes can vary a lot … by 1.5 sigma.  Then along comes a psychologist named Mikel Harry who claims the 1.5 applies to all process.  He backs it up with a ridiculous “theory”.
    Harry says six sigma is “80% TQM”, apart from the crap that he has added.  TQM is based on Deming and Shewhart and has all the good staff about reducing variation.
    Everyone says “Eureka” and pays billions to buy from Harry.
     

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    #151299

    W W
    Member

    That sounds more like TQM.  Six sigma is all about counting defects isn’t it ?

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    #151313

    systhinc
    Member

    I was a certified quality engineer when ASQ still had the C in it (American Society for Quality Control) and it was the C I concentrated on.  My spec limits didn’t allow for mean shifts.  One of them 5.99″ +0.000/-0.0005.  If I exceeded that lower limit, my products could kill the wrong people.  The same applied when I made brake lines in the automotive industry.  Mean shifts should not be allowed.

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